Special Issue "Heat Treatment of Aluminum Alloys"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 30 June 2018

Special Issue Editor

Guest Editor
Prof. Dr. Salem Seifeddine

Department of Materials and Manufacturing, School of Engineering, Jönköping University, P.O. Box 1026, SE-551 11, Jönköping, Sweden
Website | E-Mail
Interests: molten metal quality; metal casting; solidification; in situ synchrotron X-ray techniques; deformation of metals; microstructure-properties relationships at room and elevated temperatures

Special Issue Information

Dear Colleagues,

Environmental awareness and resource efficiency, along with the development of high quality and high performing aluminum components, both wrought and cast, require alloy and process-parameter optimization. The microstructure, which is the result of alloy and process selections, and henceforward the mechanical and physical properties of aluminum alloys can be further tailored by proper selections of heat treatment parameters. The properties are then a function of temperature and time during the annealing or solution heat treatment and ageing steps, but also of the quenching operation. The complex relationship that exist between the alloy, process and heat treatment parameters can be modelled in order to bring this knowledge closer to the designer, enabling further component optimization, realizing less physical testing and hence faster components to market. This Special Issue aims, therefore, to present the latest research related to microstructure formation for optimized properties through heat treatment, as well as to demonstrate the latest modelling approaches that enable predictions of microstructural features, e.g., precipitates and their relation to properties of heat treated aluminum alloys.

Prof. Dr. Salem Seifeddine
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Annealing
  • solution heat treatment
  • ageing
  • quenching
  • mechanical and physical properties
  • modelling

Published Papers (2 papers)

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Research

Open AccessArticle Microstructure of Multi-Pass Friction-Stir-Processed Al-Zn-Mg-Cu Alloys Reinforced by Nano-Sized TiB2 Particles and the Effect of T6 Heat Treatment
Metals 2017, 7(12), 530; doi:10.3390/met7120530
Received: 23 October 2017 / Revised: 8 November 2017 / Accepted: 14 November 2017 / Published: 27 November 2017
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Abstract
In this work, a fine-grained structure with a uniform distribution of TiB2 particles and precipitates was achieved in TiB2 particle-reinforced (PR) Al-Zn-Mg-Cu alloys by friction stir processing (FSP). The effects of multi-pass FSP on the microstructure, and TiB2 particle distribution,
[...] Read more.
In this work, a fine-grained structure with a uniform distribution of TiB2 particles and precipitates was achieved in TiB2 particle-reinforced (PR) Al-Zn-Mg-Cu alloys by friction stir processing (FSP). The effects of multi-pass FSP on the microstructure, and TiB2 particle distribution, as well as the microstructural evolution in the following T6 treatment, were investigated by X-ray diffraction, scanning electron microscopy and associated electron backscattered diffraction. The results showed that the distribution of TiB2 particles and alloy precipitates was further improved with an increase in the FSP passes. Moreover, compared with alloy segregation in the as-cast PR alloys during T6 treatment, a complete solution of the precipitates was achieved in the FSP-treated PR alloys. The fine-grained structure of the FSP-treated PR alloys was thermally stable without any abnormal growth at the high temperature of T6 treatment due to the pinning effect of dispersed TiB2 particles. The strength and ductility of the PR alloys were simultaneously improved by the combination of FSP and T6 treatment. Full article
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
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Open AccessArticle Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6
Metals 2017, 7(11), 463; doi:10.3390/met7110463
Received: 21 September 2017 / Revised: 20 October 2017 / Accepted: 24 October 2017 / Published: 1 November 2017
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Abstract
Various heat input conditions and post-weld heat treatments were adopted to investigate the microstructure evolution and mechanical properties of tungsten inert gas (TIG) welded joints of AA6082-T6 with porosity defects. The results show that the fracture location is uncertain when an as-welded joint
[...] Read more.
Various heat input conditions and post-weld heat treatments were adopted to investigate the microstructure evolution and mechanical properties of tungsten inert gas (TIG) welded joints of AA6082-T6 with porosity defects. The results show that the fracture location is uncertain when an as-welded joint has porosities in the weld zone (WZ), and overaging in the heat-affected zone (HAZ) at the same time. When the fracture of the as-welded joint occurs in the HAZ, the total heat input has a linear relation with the tensile strength of the joint. An excess heat input induces the overgrowth of Mg2Si precipitates in HAZ and the coarsening of α-Al grains in WZ, resulting in a decrease in the microhardness of the corresponding areas. After artificial aging treatment, the tensile strength of the welded joint is increased by approximately 9–13% as compared to that of as-welded joint, and fracture also occurs in HAZ. In contrast, for solution treated and artificial aging treated joint, fracture occurs suddenly at the rising phase of the tensile curve due to porosity defects throughout the weld metal. Furthermore, the eutectic Si particles of WZ coarsen and spheroidize after solution treatment and artificial aging treatment, due to the diffusion of Si to the surface of the original Si phases when soaking at high temperature. Full article
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
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